Stewards of the iconic buildings and grounds of Capitol Hill since 1793.

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The National Garden provides "living laboratories" for environmental, horticultural, and botanical education in a contemplative setting.
The National Garden was created as a place for visitors to experience the...

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A view of the Capitol Visitor Center lit up at night
The Office of Congressional Accessibility Services (OCAS) provides a variety...

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Painted portrait of Dr. William Thornton
 The Architect of the Capitol (AOC) is the builder and steward of America’s...

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AOC employee working on touching up columns in Statuary Hall
Next time you're in Statuary Hall on the second floor of the U.S. Capitol...

Ionic Columns

The sun shining on the Ionic Columns on the Longworth House Office Building.
Overview 

The Ionic column is typically identified by its capital, which includes large paired spiral scrolls, or volutes. It has the tallest base of the three classic Greek orders. Columns in this style can be found throughout Capitol Hill, including the U.S. Capitol, the Supreme Court Building and the exterior of the Longworth House Office Building.

The Old Senate Chamber, located in the U.S. Capitol Building, is a two-story room modeled after the amphitheaters of antiquity. Eight Ionic columns of variegated marble quarried along the Potomac River support the Chamber’s gallery on the east wall; they were inspired by the columns of the Erechtheion in Athens.

The Supreme Court Building’s grand Court Chamber is a dignified room lighted by side windows behind screens of Ionic columns. The 24 columns are made of Old Convent Quarry Siena marble from Liguria, Italy.

The Longworth House Office Building is one of Washington’s best examples of the Neo-Classical Revival architecture. Its exterior features Ionic columns that support a well-proportioned entablature and are used for the building's five porticoes, the principal one of which is topped by a pediment.